对接一个第三方应用做调试时，想打印出所有的配置，调试我这边做的配置是否有效，摸索了一番后找到了一个解决方案，废话不多说，直接上代码。

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package com.marioplus;import org.springframework.boot.CommandLineRunner;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;import org.springframework.core.env.ConfigurableEnvironment;import org.springframework.core.env.EnumerablePropertySource;import org.springframework.core.env.MutablePropertySources;import javax.annotation.Resource;import java.util.Arrays;import java.util.Collections;import java.util.Comparator;import java.util.Map;import java.util.function.Function;import java.util.stream.Collectors;import java.util.stream.StreamSupport;@SpringBootApplicationpublic class App extends SpringBootServletInitializer implements CommandLineRunner {    @Resource    private ConfigurableEnvironment springEnv;    public static void main(String[] args) {        SpringApplication.run(App.class, args);    }    @Override    public void run(String... args) throws Exception {        MutablePropertySources propSrcs = springEnv.getPropertySources();        // 获取所有配置        Map<String, String> props = StreamSupport.stream(propSrcs.spliterator(), false)                .filter(ps -> ps instanceof EnumerablePropertySource)                .map(ps -> ((EnumerablePropertySource) ps).getPropertyNames())                .flatMap(Arrays::stream)                .distinct()                .collect(Collectors.toMap(Function.identity(), springEnv::getProperty));                // key 和 value 之间的最小间隙        int interval = 20;        int max = props.keySet().stream()                .max(Comparator.comparingInt(String::length))                .orElse("")                .length();                // 打印        props.keySet().stream()                .sorted()                .forEach(k -> {                    int i = max - k.length() + interval;                    String join = String.join("", Collections.nCopies(i, " "));                    System.out.println(String.format("%s%s%s", k, join, props.get(k)));                });    }}

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